A nev.I water pump to be used by the city's maintenance department costs $12.000. A runningin period. costing $1.000 immediately, is required for a new.I pump. Operating and maintenance costs average $500 the first year. increasing by $320 per year thereafter. The salvage value of the pump at any time can be estimated by the declining-balance rate of 20 percent. Interest is 10 percent. Using a spreadsheet. calculate the EAC for replacing the pump after one year. two years. etc. HowI often should the pump be replaced? The pump should be replaced every D years. (Type a whole number.)